US Bridges

I-705 N-N Ramp over Terrain

Fair

Pierce County, Washington · JCT SR 509 · Structure no. 0014747C0000000

Built
1996
29 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
479 ft
4 main spans
Daily traffic
10,881
2012 count
Owner
State
State Highway Agency

About this bridge

I-705 N-N Ramp over Terrain is a prestressed concrete continuous box beam or girders - multiple carrying I-705 N-N Ramp over Terrain in Pierce County, Washington. It was built in 1996, so it is 29 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 10,881 vehicles a day, roughly 3% of them trucks, projected to reach 18,715 by 2036. The structure is 479 ft (146 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-705 N-N Ramp
CrossesTerrain
LocationJCT SR 509
RouteInterstate 705
CountyPierce County
StateWashington
Coordinates47.24158, -122.43353
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating63.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length479 ft (146 m)
Longest span145 ft (44.2 m)
Deck width45 ft (13.6 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,881 (2012)
Projected traffic18,715 by 2036
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-705 N-N Ramp over Terrain built?

It was built in 1996, making it 29 years old in 2025.

What condition is I-705 N-N Ramp over Terrain in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does I-705 N-N Ramp over Terrain carry?

About 10,881 vehicles per day (2012 count), of which roughly 3% are trucks.

How long is I-705 N-N Ramp over Terrain?

The structure is 479 ft (146 m) long with a longest span of 145 ft (44.2 m) and a deck 45 ft wide.

Who owns I-705 N-N Ramp over Terrain?

It is owned by the State Highway Agency.